<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Feed_Reader
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Entry.php 23953 2011-05-03 05:47:39Z ralph $
 */

/**
 * @see Zend_Feed_Reader
 */
require_once 'Zend/Feed/Reader.php';

/**
 * @see Zend_Feed_Reader_Extension_EntryAbstract
 */
require_once 'Zend/Feed/Reader/Extension/EntryAbstract.php';

/**
 * @see Zend_Date
 */
require_once 'Zend/Date.php';

/**
 * @category   Zend
 * @package    Zend_Feed_Reader
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Feed_Reader_Extension_DublinCore_Entry extends Zend_Feed_Reader_Extension_EntryAbstract {
	/**
	 * Get an author entry
	 *
	 * @param DOMElement $element
	 * @return string
	 */
	public function getAuthor($index = 0) {
		$authors = $this->getAuthors ();
		
		if (isset ( $authors [$index] )) {
			return $authors [$index];
		}
		
		return null;
	}
	
	/**
	 * Get an array with feed authors
	 *
	 * @return array
	 */
	public function getAuthors() {
		if (array_key_exists ( 'authors', $this->_data )) {
			return $this->_data ['authors'];
		}
		
		$authors = array ();
		$list = $this->_xpath->evaluate ( $this->getXpathPrefix () . '//dc11:creator' );
		
		if (! $list->length) {
			$list = $this->_xpath->evaluate ( $this->getXpathPrefix () . '//dc10:creator' );
		}
		if (! $list->length) {
			$list = $this->_xpath->evaluate ( $this->getXpathPrefix () . '//dc11:publisher' );
			
			if (! $list->length) {
				$list = $this->_xpath->evaluate ( $this->getXpathPrefix () . '//dc10:publisher' );
			}
		}
		
		if ($list->length) {
			foreach ( $list as $author ) {
				$authors [] = array ('name' => $author->nodeValue );
			}
			$authors = new Zend_Feed_Reader_Collection_Author ( Zend_Feed_Reader::arrayUnique ( $authors ) );
		} else {
			$authors = null;
		}
		
		$this->_data ['authors'] = $authors;
		
		return $this->_data ['authors'];
	}
	
	/**
	 * Get categories (subjects under DC)
	 *
	 * @return Zend_Feed_Reader_Collection_Category
	 */
	public function getCategories() {
		if (array_key_exists ( 'categories', $this->_data )) {
			return $this->_data ['categories'];
		}
		
		$list = $this->_xpath->evaluate ( $this->getXpathPrefix () . '//dc11:subject' );
		
		if (! $list->length) {
			$list = $this->_xpath->evaluate ( $this->getXpathPrefix () . '//dc10:subject' );
		}
		
		if ($list->length) {
			$categoryCollection = new Zend_Feed_Reader_Collection_Category ();
			foreach ( $list as $category ) {
				$categoryCollection [] = array ('term' => $category->nodeValue, 'scheme' => null, 'label' => $category->nodeValue );
			}
		} else {
			$categoryCollection = new Zend_Feed_Reader_Collection_Category ();
		}
		
		$this->_data ['categories'] = $categoryCollection;
		return $this->_data ['categories'];
	}
	
	/**
	 * Get the entry content
	 *
	 * @return string
	 */
	public function getContent() {
		return $this->getDescription ();
	}
	
	/**
	 * Get the entry description
	 *
	 * @return string
	 */
	public function getDescription() {
		if (array_key_exists ( 'description', $this->_data )) {
			return $this->_data ['description'];
		}
		
		$description = null;
		$description = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/dc11:description)' );
		
		if (! $description) {
			$description = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/dc10:description)' );
		}
		
		if (! $description) {
			$description = null;
		}
		
		$this->_data ['description'] = $description;
		
		return $this->_data ['description'];
	}
	
	/**
	 * Get the entry ID
	 *
	 * @return string
	 */
	public function getId() {
		if (array_key_exists ( 'id', $this->_data )) {
			return $this->_data ['id'];
		}
		
		$id = null;
		$id = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/dc11:identifier)' );
		
		if (! $id) {
			$id = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/dc10:identifier)' );
		}
		
		$this->_data ['id'] = $id;
		
		return $this->_data ['id'];
	}
	
	/**
	 * Get the entry title
	 *
	 * @return string
	 */
	public function getTitle() {
		if (array_key_exists ( 'title', $this->_data )) {
			return $this->_data ['title'];
		}
		
		$title = null;
		$title = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/dc11:title)' );
		
		if (! $title) {
			$title = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/dc10:title)' );
		}
		
		if (! $title) {
			$title = null;
		}
		
		$this->_data ['title'] = $title;
		
		return $this->_data ['title'];
	}
	
	/**
	 *
	 *
	 * @return Zend_Date|null
	 */
	public function getDate() {
		if (array_key_exists ( 'date', $this->_data )) {
			return $this->_data ['date'];
		}
		
		$d = null;
		$date = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/dc11:date)' );
		
		if (! $date) {
			$date = $this->_xpath->evaluate ( 'string(' . $this->getXpathPrefix () . '/dc10:date)' );
		}
		
		if ($date) {
			$d = new Zend_Date ();
			$d->set ( $date, Zend_Date::ISO_8601 );
		}
		
		$this->_data ['date'] = $d;
		
		return $this->_data ['date'];
	}
	
	/**
	 * Register DC namespaces
	 *
	 * @return void
	 */
	protected function _registerNamespaces() {
		$this->_xpath->registerNamespace ( 'dc10', 'http://purl.org/dc/elements/1.0/' );
		$this->_xpath->registerNamespace ( 'dc11', 'http://purl.org/dc/elements/1.1/' );
	}
}
